A thriller is a genre of literature, film, and television that uses suspense, tension, and excitement to keep audiences alert through a problem like an escape that emphasizes danger to characters, building tension to a highly stressful climax. Main thriller subgenres include psychological, crime, mystery, and political thrillers, with horror and action sometimes overlapping, while films target audiences around age 18 due to violence or psychological elements. Major studios producing thriller films include University Pictures, Summit Entertainment, and Dimension Films.